Lichen Flora of the Greater Sonoran Desert Region (Tempe) 3: 51 (2007).

Synonyms: Index Fungorum

Protolog: Ascomata dispersa, maculiformia, late erumpentia, ad 2 mm in diametro, ascomata majoria interdum fissurata vel rimosa, thallo complana vel emersa, superficie plusminusve plana, extus nigra, in sectione verticali 100-150 µm alta, stratis crystallis obscure flavo-aurantiacis interspersis. Filamenta interascalia ramosa et anastomosantia, non praesertim circum ascos aggregata, sinuousa [sic], cellulis c. 3-4 x 0.5-1 µm. Asci subglobosi, c. 100-110 x 55-65 µm, octospori, stipitati, endotunica lateriali incrassata. Ascosporae oblonge ovoideae ad ellipsoideae, c. 48-60 x 15-22 µm, hyalinae, in statu senescente brunneae, valde muriformes, isoloculares, septis transversalibus 7-9, septis longitudinalibus (1-)2-4 in omni segmento.

Protolog type data: Type: Mexico: Nayarit: San Blas, mangrove swamp, on white mangrove, 17 March 1975, T. H. Nash 10.123 (ASU - holotype).

Type locality: Mexico, Nayarit, San Blas, mangrove swamp, on white mangrove , 1 m, 17.3.1975, T. H. Nash 10123 (ASU - holotype).

Type locality coordinates: 21°32'23?N, 105°17'8?W; 21.539722°, -105.285556°.

Barcode: Data lacking.

Thallus: white-gray, with integrated bark fragments, 60-80 µm thick. Ascomata: scattered, lirellate, broadly erumpent, large ascomata sometimes fissured or cracked, up to 2 mm in diam., in section ... .

Photobiont: Trentepohlia s.l., c. 8 x c.6 µm.

Chemistry: Ascomatal gels I+ blue becoming red with blue patches, KI+ blue ... .

Ecology: Data lacking.

Distribution: Database

Molecular data: Genbank

Mycobank: Mycobank

Note: "The description for the North American material of Arthonia mesoleuca in Lendemer et al.(2009) is reminescent of another, recently described species, A. mirabilis Grube, which was also identified from Fakahatchee material. The main difference is in ascospore size (less than 50 µm long in A. mesoleuca versus more than 50 µm long in A. mirabilis) and the often more lirellate ascomata in A. mirabilis; however, it is possible that both are conspecific, in which case A. mesoleuca would be the older name" (Lücking et al. 2011).

Pictures: Tropical Lichens